Bicycle Handlebar Stem Clamp Layout for Vibration-Resistant Fastening
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Solution Overview
Problem
Conventional bicycle handlebar stems experience loosening of bolts due to vibrations on rugged roads and have exposed bolt heads that increase wind resistance and affect appearance.
Innovation Solution
A bicycle handlebar stem design featuring a top clamp with a downward portion, a bottom clamp with an upward portion, and a tongue that secures the handlebar through a passage, with fasteners connecting the clamps at an angle to resist vibrations and reduce wind resistance, while accommodating different handlebar sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional bolts are used to connect the handlebar to the handlebar stem in the direction of bicycle movement, then the connection is simple to manufacture, but the bolts loosen due to vibrations on rugged roads
Solution Approach 1:
The patent changes the orientation of the fastening direction from longitudinal (parallel to bicycle movement) to transverse (perpendicular to bicycle movement). This dimensional change allows the fastener to resist vibrations more effectively while maintaining structural simplicity. The handlebar stem includes a fastening portion with a fastening hole extending in the transverse direction, and the fastener passes through this hole perpendicular to the direction of bicycle movement, preventing bolt loosening due to vibrations.
2Ease of manufacture
If bolt heads are exposed beyond the handlebar stem, then the connection structure is simple, but the outer appearance is affected and wind resistance is increased
Solution Approach 1:
The patent extracts the fastener from the conventional exposed position and integrates it into the handlebar stem structure. The fastening portion is formed as an integrated part of the handlebar stem, with the fastening hole internally positioned. The fastener passes through this internal hole and is secured with a retaining member, so the fastener head does not protrude from the handlebar stem, eliminating the aesthetic and aerodynamic problems while maintaining manufacturing simplicity.
3Object-affected harmful factors
If the fastener is oriented perpendicular to the direction of vibration, then wind resistance is reduced and appearance is improved, but the structural complexity increases
Solution Approach 1:
The patent merges the fastening portion with the handlebar stem as an integrated structure. The fastening portion includes the fastening hole and the retaining member, which are combined into a single structural unit formed as part of the handlebar stem. This integration reduces the number of separate components and simplifies manufacturing while maintaining the perpendicular fastening orientation that reduces wind resistance and improves appearance.
Data Source
AI summary
A bicycle handlebar stem includes a body having a connection portion and a top clamp respectively formed on two ends thereof. The body includes a space defined therein, and an opening communicates with the space and outside of the body. A bottom member has a tongue extending inserted into the opening and the space. A bottom clamp is formed to the bottom member and includes an upward portion extending upwardly and toward the downward portion of the top clamp. A passage is defined between the top clamp, the bottom clamp and the body so as to receive a handlebar. A connection member extends through the body and the tongue to connect the bottom member to the body. Two fasteners extend through the underside of the bottom clamp and are connected to the top clamp.